Fears are growing of a possible housebuilding hiatus as it emerged that government-developed software used to ensure homes are compliant with building regulations may not be ready in time to use for next month’s strengthening of energy efficiency rules, house builders have warned. 

Part L and Part F of the building regulations will be updated on 15 June. Under part L, homes that have started being built after that date will have to have an overall reduction in emissions of 31%. Through Part F they will also have to be better ventilated. Part O, a new regulation on overheating, will also be introduced. 

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